Coupled U–Pb Geochronology of Monazite and Zircon for the Bozhushan Batholith, Southeast Yunnan Province, China: Implications for Regional Metallogeny

Yan, Taotao; Li, Dongsheng; Chen, Si; Qiao, Yuhui

doi:10.3390/min10030239

Cited by 4 publications

(2 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the deposit cluster, seven Sn deposits were exploited, including Malage [16], Songshujiao [17], Gaosong [18], Laochang [19], Kafang [20], Niushipo [21], and Zhujingpo Sn-polymetallic deposits. In addition, two super-large Sn deposits in Bainiuchang [22] in the northeast and Guanfang [23] in the southeast were also exploited. The main metal resource in the Gejiu area is tin, and super-large Sn deposit clusters are mainly located in the western part.…”

Section: Methodsmentioning

confidence: 99%

Tin (Sn) Geochemical Mapping Based on a Fixed-Value Method: A Case Illustration in Gejiu Area, Southwest China

Xu,

Li,

Zhang

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

Geochemical maps play an important role in mineral resource exploration. There are three traditional methods for creating geochemical maps: the cumulative frequency method, the logarithmic interval method, and the Avg±k∗Std (where Avg and Std are the abbreviations of average and standard deviation, and k is a multiple of Std) method. However, with the increasing scope of the study area and cumulative data, the limitations of traditional methods, which depend on the amount of data, are exposed. A fixed-value method for Sn geological mapping is proposed to overcome the limitations of traditional methods. In the fixed-value method, Sn concentrations are divided into 19 levels on 18 fixed values ranging from 1 μg/g (corresponding to the detection limit) to 1000 μg/g (corresponding to the cut-off grade of Sn in hard rocks). The 19 levels are mapped in six color tones. The first to fifth levels are the lowest background areas in blue tones, which correspond to Sn concentrations ranging from the minimum to 3.4 μg/g. The sixth to ninth levels are high background areas in yellow tones corresponding to concentrations less than 10 μg/g, the 10th to 12th are low anomaly areas in pink tones less than 28 μg/g, the 13th to 15th are high anomaly areas in red tones less than 200 μg/g (corresponding to the placer cut-off grade), the 16th to 18th in gray tones less than 1000 μg/g, and the 19th level is in black corresponding to Sn ores with Sn concentration not less than 1000 μg/g. The fixed-value method along with three traditional methods was used to contour the Sn geochemical maps in the Gejiu area in Southwest China. The illustration results of the presented fixed-value method and three traditional methods for geochemical mapping of Sn are all feasible for Sn deposit exploration in the Gejiu area, Southwest China. Compared to traditional methods, the presented fixed-value method overcomes the flaws of traditional methods and is also more meaningful in geochemistry.

show abstract

Section: Methodsmentioning

confidence: 99%

Tin (Sn) Geochemical Mapping Based on a Fixed-Value Method: A Case Illustration in Gejiu Area, Southwest China

Xu,

Li,

Zhang

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Monazite grains have high thermal stability (closing temperature > 800 °C) and are not very susceptible to radiation damage, which limits depletion of radiometric Pb. 69 The age of a monazite sample can be estimated from rst-order decay of 232 Th and 238 U as shown in eqn (1), 70 where N is the number of atoms/ moles of the parent isotope measured, N 0 is the number of atoms/moles originally present in the sample, l is the rate constant, and t is time. In our spICP-TOFMS analysis of monazite particles, we did not detect 204 Pb even in particles with high mass amounts of other elements (indicating a large particle), thus we assume no "common" Pb was incorporated in the monazite grain at formation and that all 208 Pb is thorogenic and all 206 Pb is uranogenic.…”

Section: Application Of Sp-isotopic Analysis To Geochronologymentioning

confidence: 99%